Question

我试图模仿Twitter的哈希标记系统，用可点击的链接替换所有主题标签。我把一个有用的片段放在一起，但我发现如果两个单词有类似的开头，那么较长的单词只会被替换（通过可点击的链接）到较短单词停止的长度。也就是说，如果我在＃toolbox＆＃39;中有一个句子#to; #tool成为一个链接，只有#toolbox中的#tool成为一个链接，而不是整个#toolbox。

以下是摘录：

<?php


//define text to use in preg_match and preg_replace 
$text = '#tool in a #toolbox';

//get all words with hashtags
preg_match_all("/#\w+/",$text,$words_with_tags);

    //if there are words with hash tags
    if(!empty($words_with_tags[0])){

        $words = $words_with_tags[0];

        //define replacements for each tagged word, 
        //   $replacement     is an array of replacements for each word
        //   $words            is an array of words to be replaced
        for($i = 0; $i < sizeof($words) ; $i++ ){

            $replacements[$i] = '<a href="'.trim($words[$i],'#').'">'.$words[$i].'</a>';

            // format word as /word/ to be used in preg_replace 
            $words[$i] = '/'.$words[$i].'/';
        }

        //return tagged text with old words replaced by clickable links
        $tagged_text = preg_replace($words,$replacements,$text);

    }else{
        //there are no words with tags, assign original text value to $tagged_text
        $tagged_text = $text;
    }


echo $tagged_text;


?>

Answer 1

capturing如何做一个简单的preg_replace()

$tagged_text = preg_replace('~#(\w+)~', '<a href="\1">\0</a>', $text);

Test at eval.in 输出到：

<a href="tool">#tool</a> in a <a href="toolbox">#toolbox</a>

Test at regex101

Answer 2

您可以使用preg_replace_callback

<?php

$string = "#tool in a #toolbox";

 $str = preg_replace_callback(
            '/\#[a-z0-9]+/',
            function ($matches) {
                return "<a href=\"". ltrim($matches[0], "#") ."\">". $matches[0] ."</a>";
            }, $string);
    echo $str;
    //Output: <a href="tool">#tool</a> in a <a href="toolbox">#toolbox</a>

https://eval.in/198848

php preg_match_all / preg_replace正在截断类似匹配的替换

2 个答案: